The support of terrorism charge centers on repeated pledges of allegiance to the Islamic State that Mateen made before and during the shooting.

At the time of the shooting, Salman was in the couple's home in Fort Pierce.

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Pulse nightclub shooting timeline

Salman, dressed in black slacks and a white blouse covered by a black sweater Thursday, sat quietly through the tedious process of selecting 18 people to serve as jurors and alternates.

That process began at 9 a.m., with Byron questioning potential jurors individually about their personal circumstances, whether they had any connection to anybody involved in the Pulse massacre or any other acts of terrorism and their ability to act as fair and impartial jurors. He also allowed the attorneys for the defense and prosecution to ask additional questions.

By the end of the day, Byron had interviewed 10 potential jurors. Four were excused for reasons ranging from medical issues to having an infant at home.

The Pulse nightclub site in November.(Photo: John Raoux, AP file)

One of the potential jurors was excused after saying she had strong feelings about guns and didn't understand why anyone felt the need to have one or shoot for sport. The fact that Salman had legally participated in target practice in the past might be entered into evidence at the trial.

During the proceedings, friends and family members of the Pulse victims came and went from the courtroom.

Salman was indicted on the charges Jan. 12, 2017, by a grand jury sitting in Orlando. She was arrested days later in San Francisco and extradited in April.

The California magistrate initially assigned to the case permitted Salman's release on $500,000 bail, but Byron quickly stepped in to revoke the decision.

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Standing on a ladder to place a banner is Mayra Alvear, whose daughter Amanda was killed at the Pulse mass shooting. Her hand is on a photo of Amanda. People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 terror attack by a single gunman that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

Mayra Alvear, of Tampa, who lost her daughter Amanda to the Pulse gunman, is hugged by Tamora Jones of Winter Haven, who often visited Pulse when it was still open. People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

Yesenia Garcia and Hansel Lopez, of Lakeland, were among the people gathered on a Sunday in the parking lot of Pulse nightclub in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

Jason Williams, 10, was one of those gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the mass shootingthat took 49 lives.
TIM SHORTT/ FLORIDA TODAY

People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 mass shooting that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

People are creating a garden of painted rocks at the edge of the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando, site of the deadliest mass shooting by a single gunman in U.S. history.
TIM SHORTT/ FLORIDA TODAY

The women in this banner photo, left to right, Mercedez Flores and Amanda Alvear. were killed by the Omar Mateen, the gunman who pledged allegiance to ISIS. People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

The main sign in front of the closed Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

People gathered on a Sunday in the parking lot of Pulse nightclub in Orlando, Fl., the week before the first anniversary of the June 12, 2016 terror attack by a single gunman.
TIM SHORTT/ FLORIDA TODAY

People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

Jason Williams, 10, writing inspirational messages on rocks to be placed in the parking lot of Pulse nightclub in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.
TIM SHORTT/ FLORIDA TODAY

A.J. Williams, 12, writes messages and creates art on rocks to place in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 mass shooting that took 49 lives.
TIM SHORTT/ FLORIDA TODAY

One of many memorials that have been placed along a fence in the parking lot of Pulse nightclub where the deadliest mass shooting by a single gunman in U.S. history took place.
TIM SHORTT/ FLORIDA TODAY

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"The existence of the defendant's past involvement in a terrorist attack, even recognizing she did not pull the trigger, poses too great of a danger to the community to warrant pretrial release," Byron wrote in a March order.

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Bryan Manley and Greg Mitchell both of Orlando last their best friend they were two of Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Heidi Skeha (front) of Orlando one Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Macaila Fernandes of Orlando one Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Macaila Fernandes of Orlando one Thousands who came out for Sunday nights candlelight vigil held at Lake Eloa for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Heidi Skeha (front) of Orlando one Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Bryan Manley and Greg Mitchell both of Orlando last their best friend they were two of Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

Van Dang of Orlando one of Thousands who came out for Sunday nights candlelight vigil held at Lake Eola for the 49 victims of the mass shooting at Pulse nightclub in Orlando .
Craig Rubadoux/ FLORIDA TODAY

An appellate court upheld the decision in May, describing Salman as a flight risk and danger to the community. She has been detained ever since, though it is unclear where.

Jury selection could take a week to 10 days and the trial is expected to take about three weeks.

Jury selection continues at 9 a.m. Friday.

Contact McCarthy at 321-752-5018

or jmccarthy@floridatoday.com.

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The women in this banner photo, left to right, Mercedez Flores and Amanda Alvear. were killed by the Omar Mateen, the gunman who pledged allegiance to ISIS. People gathered on a Sunday in the parking lot of Pulse nightclub at 1912 S. Orange Avenue in Orlando the week before the first anniversary of the June 12, 2016 deadliest mass shooting by a single gunman in U.S. history, that took 49 lives, and injured over 50.(Photo: TIM SHORTT/ FLORIDA TODAY)